Sealing method and apparatus for wellheads
US5325925A · kind A · utility
52Cited by
10References
64Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1992 |
| Grant date | Jul 5, 1994 |
| Priority date | — |
| Expiry date | Jun 26, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A metal-to-metal sealing method and apparatus for use on oil and/or gas wells, utilizes an upper seal member and a lower seal member, wherein the energizing of the seal members is staged to cause the lower seal member to become sealingly engaged. before the upper seal member becomes sealingly engaged. The seal members may have two seals of different construction; one seal is an interference type seal, and the other seal is a wedge type seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.